Hypodermic syringe.



'PATENTED MAY 2 6, 1903. c. J. TAGLIABUE 1 P. w. STEUER.

-HYPUDERMIC SYRINGE.

APPLICATION FILED DBO. 9,1901.

N0 MODEL.

INVENTORS 12% ATTOBN EYS 1 @dwf/f BY 'wnNEssEsl1 UNITED STATES PatentedMay 26, 1903.

PATENT OEEICE.

CHARLES J. TAGLIABUE AND FREDERICK WILLIAM STEUER, OF BROOKLYN, NEWYORK; SAID STEUER ASSIGNOR TO SAID TAGLIABUE..

HYPODERMIC SYRINGE.

SPECIFICATION forming part of Letters Patent N. 729,011, dated May 26,1903. Application led December 9, 1901. Serial No. 85,127. (No model.)

To @ZZ whom it may concern:

Be it known that we, CHARLES J. TAGLIA- BUE, a citizen of the UnitedStates, and FRED- ERICE. WILLIAM STEUER, a subject of the King ofDenmark, both residing in the borough of Brooklyn,Kings county,city andState of New York, have invented certain new and useful Improvements inHypodermic Syringes, of whichthe following is a specification.

Our invention relates to hypodermic syringes, and has for its object,first, to provide an improved construction for obtaining a tight jointat the delivery end of the syringe where the injection-needle isapplied, and,`

second, to improve the piston with a View of enabling the same to bereadily pressed more or less tightly against the barrel.

Our invention will be fully described hereinafter and the features ofnovelty pointed out in the appended claims.

Reference is to be had to the accompanying drawings, in which- Figure lis a longitudinal section of one form of our improved hypodermicsyringe. Fig. 2 is a detail view of part of the piston-rod and means forexpanding the piston. Fig. 3 is a side view of the piston and theadjacent parts of the piston-rod. Fig. 4 is an end view of the piston.upon line 5 5 of Fig. l. Fig. is a longitudinal section of the piston,and Fig. 7 shows another form of our invention with parts in section.

In carrying out our invention we employ a suitable barrel A, preferablycylindrical and of the same diameter throughout its length except at thedelivery end, as will be more fully set forth hereinafter. At thesuction end the barrel may be of any suitable construction, and, asshown in the drawings, it may be provided with a cap B, adapted to screwon the barrel, and tted with or carrying projections C, adapted to begrasped by the operators ngers. The cap B is perforated for the passageof the piston-rod D, having a head D' and provided at its inner end withtwo screw-threaded portions D2 D2 of opposite pitch. Qn thesescrew-threads are mounted two expanders E F, respectively, which areprovided with tapering faces, their Fig. 5 is a cross-section smallerdiameters facing toward each other. The expander E is screwed tightlyagainst the end of the piston-rod, and to facilitate this the expandermay be provided with a slit E. The expander F has a polygonal or angu-llar extension F at its outer portion, and this angular extension isadapted to become seated in a similarly-shaped recess B of the cap B.Thus when the piston-rod is drawn outward and the expander F by itsextension F becomes locked against turning relatively to the barrel Athe rotation ofthe piston-rod D will cause the said rod,together withthe expander E, to move slowly inward or outward, and thus the distancebetween the two expanders E and F may be increased or diminished withouttaking the instrument apart.

With the inclined faces of the expanders E and F are engaged similarfaces G' at the ends of a piston G, which is a thin sleeve of Very hardsteel, such as is known under the name of glass-hard steel. Thismaterial has suicient elasticity tobulge outward when the expanders arepressed toward each other, and it will be understood that by the meanshereinbefore described the pressure of the piston G against the innerwall of the barrel A may be varied at will, so as to always insure atight joint.

The advantage of having the screw-threaded portions D2 D3 of thepiston-rod D which engage the threads of the expanders E F of oppositepitch will he apparent upon considering the action occurring when it isdesired to expand the sleeve member G of the piston.

AFor this purpose the rod D would be turned so as to screw itoutwardlyin the expander F, the latter being then seated in the recessB', and therefore stationary. This movement would in consequence of thethreads D2 D3 being of opposite directions cause the rod D to screw intothe expander E, or at least give it a tendency to do so. Were the twothreads of like pitch there would obviously be danger of the expanders Ebecoming loose andy rendering the device inoperative.

The delivery end of the barrel A is made with a flaring seat A', adaptedto receive a conical hollow plug I-I, which, as shown in Fig. l, has ascrew-stem H2 to receive the needle-carrier I, or said carrier may bemade in- IOO en A

tegral with the plug H. A shoulder H is formed upon the plug H, andagainst this shoulder bears a cap J, which screws on the barrel A.Therefore by screwing down the cap J the plu g H will be pressed firmlyagainst the seat A', and a tight joint will be obtained at this pointalso.

The construction shown in Fig. 7 differs from the one illustrated byFig. l in that the plug h is provided with an upwardly-reducedprojection h2, which lits into the needle-carrier z', which is providedat its lower end with a conical seat arranged to t the projection h2.For the sake of clearness we have somewhat exaggerated in the drawingsthe taper of this projection and of the conical seat. The cap j, which,as in the construction first described, engages the shoulder h' of theplug and throws the latter Vagainst the barrel A, is provided at itscenter with a screw-thread adapted to receive thelower end of theneedle-carrier i. It will of course be understood that in bothconstructions the plugH his perforated from end to end, so that thesubstance to be injected may pass through the plug. In the constructionrepresented in Fig. 7 there are two joints between contacting conical surfaces--to wit, one joint between the plug h and the seat A and anotherjoint between the projection h2 and the interior seat on theneedle-carrier z'. We desire it ,to be understood that theneedle-carrier may be formed integral with the needle K, or the needlemay be attached thereto in any approved manner. Fig. 7 also shows aslightly-different form of suction-cap B2 from that shown in'Fig. 1 anda different arrangement of linger-holds C.

The cap Jj and the end of the barrel A, with the shoulder H' h of theplug H h, form together a chamber which is imperforate, so that even ifsome of the liquid should pass the joint between the plug and the barrelit could not escape `directly to the outer surface of the barrel.

All the parts of our improved syringe, or at least all that come incontact with the substance to be injected, may be metallic and aretherefore not exposed to deterioration to the same extent asconstructions in which rubber joints and the like are employed. Anabsolute tight joint may be obtained both at the piston and at thedelivery end of the barrel, and the wear of the piston may becompensated for by expanding it in the manner hereinbefore describedwithout any necessity for taking the syringe apart.

When the needle-carrier is detachable from the plug, we secure theimportant advantage of being able to employ a set of dierent needleswith the same plug. Owing to its conical shape, the plug will fitbarrels of various sizes within certain limits.

Having described our invention, what we claim, and desire to secure byLetters Patent, 1s-

1. The combination of the barrel, the piston-rod mounted to turn andslide therein, said rod being provided, at different points of itslength, with screw-threads of opposite pitch, expanders screwingrespectively on Vsaid threaded portions of opposite pitch, an

expansible member engaging said expanders and the inner Wall of thebarrel, and means7 located in the path of one of the expanders, forholding such expander against rotation.

2. The combination of the barrel, the piston-rod mounted to movetherein, two expanders mounted on said rod at different points of itslength and movable one relatively to the other, said expanders beingbeveled or tapered toward each other, and an expansible sleeve made ofelastic material and having its ends engaged with the beveled sur-'faoes of the expanders while the body ot' said sleeve surrounds at adistance that portion of the piston-rod which is between the expanders,leaving the body of the sleeve free to move toward or from said rod, theouter surface of the sleeve being in engagement with the inner surfaceof the barrel.

3. The combination of the barrel having a beveled surface at itsdelivery end, the piston movable in the barrel, the perforated plugarranged to engage said beveled surface and to form a tight jointtherewith, said plug being provided upon its outside with a centralprojection which tapers toward its free end, a cap for pressing the plugagainst the barrel, and a tubular needle-carrier supported on said capand having a flaring inner surface arranged to engage the projection ofthe plug and to form a tight joint therewith.

CHARLES J. TAGLIABUE. FREDERICK WILLIAM STEUER.

Witnesses:

JOHN LOTKA, EUGENE EBLE.

IOC

